Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3004 - Railroad Passenger Cars
- ItemWerkema371 - Northern Pacific Slumber Coach passenger car in 1971.
- ItemWerkema372 - Northern Pacific Day/Nite Coach at Denver, Colorado, in 1971.
- ItemWerkema373 - Northern Pacific coach 634 on the Lake Whatcom Railway at Park, Washington, in 1993.
- ItemWerkema374 - Northern Pacific coach 634 on the Lake Whatcom Railway at Park, Washington, in 1993.
- ItemWerkema375 - Northern Pacific coach 1372 in a train in 1960.
- 20 more...